where H0 is the hardness in the limit of infinite depth (i.e., bulkequivalent
hardness) and h* is a characteristic length that depends
on the material and the shape of the indenter. In this case, h* can
be considered a constant for a given material and indenter. As the
indentation depth (h) increases, the measured hardness value
decreases gradually and approaches H0 progressively. Additionally,
there is no significant difference between the data of each single
indent, which ensures accuracy in the measurements